{"id":1957,"date":"2025-12-02T21:43:03","date_gmt":"2025-12-02T16:13:03","guid":{"rendered":"https:\/\/aepsseva.in\/blog\/?p=1957"},"modified":"2025-12-02T21:51:09","modified_gmt":"2025-12-02T16:21:09","slug":"aeps-usb-device-not-recognized-error","status":"publish","type":"post","link":"https:\/\/aepsseva.in\/blog\/aeps-usb-device-not-recognized-error\/","title":{"rendered":"AEPS USB Device Not Recognized Error \u2013 What to Do & How to Fix Error 999"},"content":{"rendered":"

When working with Aadhaar Enabled Payment System devices, one of the most frustrating issues agents face is the AEPS USB Device Not Recognized Error<\/strong>. This single error can halt customer service, delay withdrawals, and affect your transaction volume. In this article, we\u2019ll take a deep dive into why<\/em> this happens, what you can do immediately<\/em>, and how to permanently fix it<\/em>.<\/p>\n

\"AEPS
AEPS USB Device Not Recognized Error Fix<\/figcaption><\/figure>\n
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What Is AEPS USB Device Not Recognized Error?<\/strong><\/h2>\n

After plugging in your biometric scanner (like Mantra, Morpho, Startek, SecuGen), Windows sometimes pops up the message:<\/p>\n

\u201cUSB Device Not Recognized\u201d<\/strong> or
\u201cThe last USB device you connected malfunctioned and Windows does not recognize it.\u201d<\/strong><\/p>\n

This usually means the system can\u2019t read or communicate with your biometric device.
It can happen due to drivers, ports, power issues, RD service failures, or software conflicts.<\/p>\n

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Why Does the AEPS USB Device Not Recognized Error Occur?<\/strong><\/h2>\n

Understanding the root cause saves hours of troubleshooting. Here are the 7 most common reasons<\/strong>, backed by field experience across AEPS service centers:<\/p>\n

1. Outdated or Missing Biometric Drivers<\/strong><\/h3>\n

Every device\u2014Mantra MFS100, Morpho MSO1300, Startek FM220\u2014needs a compatible driver and RD service. If these are missing or outdated, the system fails to detect the device.<\/p>\n

2. Faulty or Low-Power USB Port<\/strong><\/h3>\n

AEPS biometric scanners require stable 5V USB power. Loose ports, damaged cables, and non-powered hubs often trigger connection failures.<\/p>\n

3. RD Service Not Running Properly<\/strong><\/h3>\n

Even if the drivers are installed, the RD (Registered Device) service<\/strong> must be active.
When RD service crashes or stops, Windows can\u2019t recognize the device.<\/p>\n

4. Conflicts With Other USB Devices<\/strong><\/h3>\n

Using multiple scanners, USB modems, or card readers can lead to driver conflicts.
AEPS devices are sensitive and often require a dedicated USB port.<\/p>\n

5. Windows Update Issues<\/strong><\/h3>\n

Statistics show that almost 21% of Windows USB failures<\/strong> occur after system updates (Microsoft Support Data, 2022).
Updates may overwrite driver files or block unsigned drivers.<\/p>\n

6. Corrupted Device Cache (Windows USB Registry)<\/strong><\/h3>\n

Over time, Windows stores faulty cache information, leading to the AEPS USB Device Not Recognized Error.<\/p>\n

7. Damaged Hardware<\/strong><\/h3>\n

If the device has internal damage or the cable has broken pins, Windows cannot read it at all.<\/p>\n

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How to Fix AEPS USB Device Not Recognized Error \u2013 Step-by-Step Solutions<\/strong><\/h2>\n

Below are long-tail keyword-optimized<\/strong>, practical troubleshooting methods that AEPS operators, CSP centers, and retailers can follow.<\/p>\n

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1. Restart RD Service on Your PC (Most Common Fix)<\/strong><\/h2>\n

If you’re using Mantra<\/strong>, Morpho<\/strong>, or Startek<\/strong>, restart their RD service:<\/p>\n

Steps:<\/strong><\/p>\n

    \n
  1. \n

    Press Windows + R<\/strong><\/p>\n<\/li>\n

  2. \n

    Type: services.msc<\/code><\/p>\n<\/li>\n

  3. \n

    Search your device service:<\/p>\n